<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>练习</title>
</head>
<body>
<table border="1px" cellspacing="0" cellpadding="10px">
<tr>
    <th colspan="3" align="center">菜价单</th>
</tr>
<tr>
    <th rowspan="5" align="center">序号</th>
</tr>
<tr>
    <th>菜名</th>
    <th>菜价</th>
</tr>
<tr>
    <td>白菜</td>
    <td>3￥</td>
</tr>
<tr>
    <td>青菜</td>
    <td>3￥</td>
</tr>
<tr>
    <td>芹菜</td>
    <td>3￥</td>
</tr>
</table>
</body>
</html>